A volcanic winter is a reduction in global temperatures caused by volcanic ash and droplets of sulfuric acid and water obscuring the Sun and raising Earth's albedo (increasing the reflection of solar radiation) after a large, particularly explosive volcanic eruption.
What <span>scientists are trying to understand about the climate of earth by analyzing these ice samples is changes in atmospheric gas composition.
By examining small pockets of air trapped deep within frozen glaciers, these scientists want to see whether or not, or how gas composition within these glaciers changes and how it affects the atmosphere that surrounds our planet.
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Answer:
The correct answer is -
The independent variable - Humidity levels
The dependent variable - Height
The control group - Tree kept outside of the greenhouse
Explanation:
In this study or experiment, the independent variable is the different humidity level as it is what is changed in the study to see its effect on the growth of the redwood tree. The independent variable is manipulated in the experiment to see the change or effect in the dependent variable occurs.
The dependent variable is the variable which \depends on the independent variable as the Independent variable manipulated the dependent variable is measured to the effect which is the height of the redwood trees here.
The control group is a groub of subjects that did not get the treatment that experiment group recieves as it is kept for analysing the deviation from the natural condition. The control group is the redwood trees that are kept in natural environemnt outside of the greenhouse.
Options for the question have not been provided. They are as follows:
A) The single intact parcel would have a smaller amount of edge than the 20 separate parcels.
B) The isolated hectare plots increase the ability of individuals to disperse from one habitat to another.
C) The separate 1-hectare plots are less vulnerable to edge effects.
D) The large plot will create more inbreeding in many species.
Answer:
A) The single intact parcel would have a smaller amount of edge than the 20 separate parcels.
Explanation:
In the given case, 20 hectares of land has been allocated to natural habitat. This means that natural flora and fauna will flourish here without any human interference. In this situation it is better to have an intact 20 hectares area at one side of the land, rather than having 20 separately spread out 1 hectare areas. This is because having one large piece of land at one side will reduce the edge effect.
Edges occur where two different habitats meet. While edges can be beneficial when it comes to natural habitats because the boundary habitat increases overall biodiversity, it can be detrimental when the edges are due to human settlements. It will be difficult to avoid human interference as the natural habitats are scattered among human settlements. Each individual plot will also get less area due to which it will be difficult for all the species to accommodate comfortably. Many animals can venture out in search of food which can be dangerous to both animals and humans. It is better to have a big separate land at one corner so that everyone can survive peacefully.
